Science shows that we are born with powerful tools for overcoming our perilous complacency. We have the genetic smarts and the cultural smarts. We have the technological know-how. We even have the inclination. The truth is we can change with breathtaking speed, sculpting even "immutable" human nature. Forty years ago many people believed human nature required blacks and whites to live in segregation; 30 years ago human nature divided men and women into separate economies; 20 years ago human nature prevented us from defusing a global nuclear standoff. Nowadays we blame human nature for the insolvable hazards of global warming.

The 18th-century taxonomist Carolus Linnaeus named us Homo sapiens, from the Latin sapiens, meaning "prudent, wise." History shows we are not born with wisdom. We evolve into it.